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Bhupathi YadavBhupathi Yadav 

When i am updating long text fields values through apex first value its taking as null

User-added imageAny resason why its taking as null.
Code whre i am hard coding the value:
User-added image
Bhargavi TunuguntlaBhargavi Tunuguntla
Hi Bhupathi,

Just check a null condition:
 
if(description!=null)
   description+='ur data';
else
   description='ur data';

Hope this may work out for you.

Thanks
Bhargavi.